\\[-1.8ex] Soil Heterogeneity & $-$0.130$^{**}$ & $-$0.065$^{***}$ & $-$0.067$^{***}$ & $-$0.066$^{***}$ & $-$0.065$^{***}$ & $-$0.063$^{**}$ \\ 
  & (0.057) & (0.025) & (0.025) & (0.025) & (0.024) & (0.024) \\ 
\\[-1.8ex] 
Observations & 101,132 & 101,132 & 101,132 & 101,132 & 101,132 & 100,689 \\ 
R$^{2}$ & 0.001 & 0.304 & 0.305 & 0.305 & 0.306 & 0.306 \\ 
